Spin States (d Electrons)
Spin states when describing transition metal coordination complexes refers to the potential spin configurations of the metal center's d electrons. In many these spin states vary between high-spin and low-spin configurations. These configurations can be understood through the two major models used to describe coordination complexes; ligand field theory, which is an application of molecular orbital theory to transition metals, and crystal field theory, which has roots in VSEPR theory.
Read more about Spin States (d Electrons): Ligand Field Theory Vs Crystal Field Theory, High-spin and Low-spin Systems
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